| Shi, Lankun, Jiao, Rongji, Liang, Haimei, Zhao, Yue, Sun, Boyu, Lan, Dawei, Liu, Kun, Chen, Xiaoxia, Lang, Zhongmin and Cui, Jinlong 2025. Amorphous carbon-anchored SnS2 microspheres constructed from ultrathin nanosheets for high initial coulombic efficiency anodes in sodium-ion batteries. Electrochimica Acta 541 , 147350. 10.1016/j.electacta.2025.147350 |
Abstract
SnS2 has attracted widespread research attention as an anode material for sodium-ion batteries (SIBs) because of its excellent theoretical specific capacity. Unfortunately, its practical application is hindered by its inherently low conductivity, substantial volume expansion during cycling, and particularly the unsatisfactory initial Coulombic efficiency (ICE). Here, carbon particles from walnut shells were anchored onto SnS2 microspheres composed of interwoven nanosheets via a one-step hydrothermal method to synthesize SnS2/C composites. C particles on the surface of SnS2 microspheres can effectively mitigate structural degradation caused by volume expansion during (dis)charge cycles. The incorporation of amorphous C helps maintain the structural integrity of SnS2 and facilitates the formation of a stable solid electrolyte interphase (SEI) film. Furthermore, it reduces the binding energy between Sn and Na2S, thereby enhancing the reversibility of SnS2 regeneration during the charging process. In addition, carbon particles suppress the sulfur shuttle effect through both chemical and physical interactions. Consequently, the synthesized SnS2/C composite demonstrates a substantial specific capacity of 621.2 mAh g-1 along with an enhanced ICE of 88.4% at 0.1 A g-1. Moreover, it exhibits an excellent cycling stability, retaining a specific capacity of 432.9 mAh g-1 after 950 cycles at 2.0 A g-1. The enhanced Na+ storage capability of SnS2/C anode contributes to the outstanding rate performance and cycling durability of constructed SIB full cell, indicating its promising applicability in high-performance practical scenarios.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Chemistry |
| Additional Information: | License information from Publisher: LICENSE 1: Title: This article is under embargo with an end date yet to be finalised. |
| Publisher: | Elsevier |
| ISSN: | 0013-4686 |
| Date of Acceptance: | 8 September 2025 |
| Last Modified: | 18 Sep 2025 09:50 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/181163 |
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